Eps Backup Power Port Operation - HP ProCurve J8161A Installation And Getting Started Manual

Introducing the HP ProCurve 600/610 External Power Supplies

EPS Backup Power Port Operation

For example, the HP 600 RPS/EPS can allocate 408 W of power to port 1 and
none to port 2, or each port can be allocated 204 W. The HP 610 EPS can
allocate all 408 W of power to port A1 (in pair A) and none to port A2, or each
port can be allocated 204 W.
If power is shared between the two EPS ports, current limits are set to prevent
an over-current condition. An over-current condition causes the port power
to be shut down. Also, EPS power may not be delivered if a connected device
has not successfully communicated for EPS power. Lastly, if the internal EPS
power supply fails, EPS power will be lost unless backup power is provided
from another HP 610 EPS in a backup power group. Try disconnecting, then
reconnecting the EPS cable to restore EPS power. See "Recommended
Connection Topologies" on page 2-16.
EPS Backup Power Port Operation
Up to five HP 610 EPS units can be connected together through EPS backup
power cables, but the EPS backup power ports can provide redundant power
to only one unit whose AC power fails. The active units can provide up to
850 W of power to a single failed HP 610 EPS.
The HP 610 EPS is able to detect other units connected to the backup power
ports and also the status of their primary AC power supply. The HP 610 EPS
supports a hot-plug feature where units can be connected or disconnected to
the backup power ports without causing any disruption to the units in the
backup power group.
N o t e
HP recommends connecting the "IN" connector first, then connect the "OUT"
connector. Connecting in this manner ensures there is no voltage on the cable.
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